/*
 * Copyright (C) 2009 M. Hautle.
 * 
 * This file is part of TrackedBean.
 * 
 * TrackedBean is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free
 * Software Foundation, either version 3 of the License, or (at your option) any later version.
 * 
 * TrackedBean is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
 * A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public License along with TrackedBean. If not, see <http://www.gnu.org/licenses/>.
 */
package ch.trackedbean.binding.components.renderers;

import java.awt.*;
import javax.swing.*;
import ch.simpleel.*;

/**
 * {@link ListCellRenderer} renderer using {@link ELExpression} to extract a {@link String} out of a given bean.
 * 
 * @author M. Hautle
 */
public class SimpleELListRenderer extends DefaultListCellRenderer {
    /** The expression */
    private final ELExpression expression;

    /**
     * Default constructor.
     * 
     * @param el An string containing el expression escaped in <code>${el}</code> blocks
     * @param undefined The string to use for undefined values
     */
    public SimpleELListRenderer(String el, String undefined) {
        expression = new ELExpression(el, undefined);
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public Component getListCellRendererComponent(JList list, Object value, int index, boolean isSelected, boolean cellHasFocus) {
        if (value != null)
            value = expression.evaluate(value);
        return super.getListCellRendererComponent(list, value, index, isSelected, cellHasFocus);
    }
}
